Fusion GPS has disclosed the six-figure amount it gave an ex-British spy to compile the Trump dossier

President Donald Trump has denied the authenticity of the dossier Fusion GPS paid for. Getty Images/Pool

Fusion GPS disclosed that it had paid Christopher Steele $168,000 to create a dossier on Trump's ties to Russia.

Although it has been publicly known that they had funded the project, this is first time they have reveled the amount they paid.

The claims in the dossier are central to the Russia investigations by Special Counsel Robert Mueller and Congress.

WASHINGTON (Reuters) - A Washington research firm paid a former British spy's company $168,000 for work on a dossier outlining Russian financial and personal links to Donald Trump's 2016 election campaign, the U.S. firm said in a statement on Wednesday.

Although it was public knowledge that Fusion GPS paid for the work, the amount had not been disclosed. Fusion GPS hired former MI6 officer Christopher Steele to collect information about Trump and his advisers.

Fusion GPS' statement said it had told Congress about how $168,000 was paid last year to Orbis Business Intelligence, Steele's company.

The money paid to Orbis was taken from $1.2 million it received in fees and expenses from the Perkins Coie law firm, the statement said. The law firm represented the Democratic National Committee and Hillary Clinton's presidential campaign, although initial research by Fusion into Trump and other Republican primary candidates was commissioned by a conservative website.

Steele's reports are central to investigations by a special counsel and congressional committees into U.S. intelligence agency allegations that Russia tried to help Trump's campaign. Russia had repeatedly denied the allegations. Trump denies any collusion with Moscow officials, calling the probes a witch hunt.

In an Oct. 29 message posted on Twitter, President Trump said the dossier had cost as much as $12 million, without providing evidence.

"Never seen such Republican ANGER & UNITY as I have concerning the lack of investigation on Clinton made Fake Dossier (now $12,000,000?),...." Trump tweeted.

Sources familiar with Steele's work said he began working for Fusion GPS in May 2016 and stopped with the election. Earlier, a Washington-based conservative website backed by a wealthy Republican donor, the Washington Free Beacon, hired Fusion to conduct research on Trump and other Republican candidates.

(Reporting By Mark Hosenball; Editing by John Walcott and Grant McCool)